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The biggest difference I see in batteries is "in the old days" a battery just got weaker and weaker and weaker gave you lots of warning it was not going to last much longer. Now that just DIE 100% in an instant. The last 7 or 8 batteries I have had were fine one minute and dead the next. I have had some that die so completely that even with jumper cables attached they will not start the car.
A friend that works at a Interstate battery store said the reason is the plates are thinner and thinner. They can get more plates into the battery but they are more prone to get to thin and collapse and short and the battery is toast. That sound plausible but I don't know for sure that is the reason.
The first sign I have that a battery is not perfect, I replace it. I would rather waste a little money up front than be stuck in a parking lot again.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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